CN102718376A - Device and method for performing hydrothermal pretreatment on sludge - Google Patents
Device and method for performing hydrothermal pretreatment on sludge Download PDFInfo
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- CN102718376A CN102718376A CN2012102341942A CN201210234194A CN102718376A CN 102718376 A CN102718376 A CN 102718376A CN 2012102341942 A CN2012102341942 A CN 2012102341942A CN 201210234194 A CN201210234194 A CN 201210234194A CN 102718376 A CN102718376 A CN 102718376A
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Abstract
The invention relates to a device and a method for performing hydrothermal pretreatment on sludge. The device comprises two hydrothermal distilling kettles running alternatively. Specific to each run cycle, the method comprises firstly adding dilution water into a first hydrothermal distilling kettle, wherein proper amount of alkali is preferably added; then introducing pressure-released steam from a second hydrothermal distilling kettle into the first hydrothermal distilling kettle to preheat the dilution water; adding dewatered sludge into the first hydrothermal distilling kettle, and simultaneously smashing the dewatered sludge into small pieces to enter the preheated dilution water with uniform dispersion; adding boiler steam into the first hydrothermal distilling kettle in order to achieve stirring and heating of materials; allowing pressure and temperature in the first hydrothermal distilling kettle to rise to reach conditions required by hydrothermal reaction, and keeping the conditions required by the hydrothermal reaction for a certain time to fully hydrolyze and slurry the sludge; and then releasing pressure to discharge the sludge. By means of the device and the method for performing the hydrothermal pretreatment on the sludge, the hydrothermal pretreatment of the dewatered sludge can be effectively achieved, the device operation reliability is high, the heat utilization rate is high, and the flash evaporation operation is not needed.
Description
Technical field:
The present invention relates to useless admittedly recycling field, relate in particular to a kind of hydrothermal pretreatment apparatus and method that are used for mud, especially Gao Hangu (like what dewater) mud.
Background technology:
Municipal sludge is meant the general name of the formed residue of blowing out in settling that the municipal sewage plant is produced and sewage surface of floating foam in to sewage treatment process.At present, China's municipal sludge contracts amount has reached the scale of 3,000 ten thousand tons (with dewatered sludge estimations of water ratio 80%), and to " 12 " latter stage, expectation will reach nearly 5,000 ten thousand tons scale.Yet China's sludge treatment technique is started late, and there is the phenomenon of " the light mud of heavy water " in the early stage sewage work that builds, and the safe handling of mud becomes the weak link in China water pollution control field.
According to external in the correlation technique aspect the sludge treatment; The technological line of containing west 95% above main flow sludge treatment at present has following four kinds: deep dehydration+landfill; Mummification+burning+lime-ash landfill or building materials utilization, aerobic fermentation+soil utilization (agricultural is main) and anaerobic digestion+soil utilization (agricultural is main).
Because the social demand of Sustainable development and the support on policy of government department, the center of gravity that current municipal sludge is handled turn to development of resources by polluting control.The anaerobic digestion techniques of mud because of its plurality of advantages that has, has become one of focus of domestic and international sludge treatment.
Dehydrating municipal sludge is handled the formed dewatered sludge in back, and water ratio is about 80% usually, as not dealing carefully with, will cause secondary pollution to environment, also is the waste to renewable resources simultaneously.But dewatered sludge viscosity is big, dewatering is poor, anaerobic digestion performance is also lower, thereby has limited its further stabilization treatment and safe disposal.Therefore, develop a kind of preconditioning technique and device that can promote follow-up dehydration or anaerobic digestion effect, will help to solve the difficult problem of mud subsequent disposal.
Summary of the invention:
The present invention relates to a kind of apparatus and method that are used for the hydrothermal pretreatment of mud, especially Gao Hangu (like what dewater) mud.Said device comprises at least two hydro-thermal distilling kettles, realizes and said method is the alternate run of two hydro-thermal distilling kettles through apparatus of the present invention.
The device that is used for the dewatered sludge hydrothermal pretreatment of the present invention comprises at least two hydro-thermal distilling kettles, wherein each hydro-thermal distilling kettle comprise opening for feed, destroyer, steam inlet, vapor-nozzle, as discharge pressure release steam or introduce vapor interface, the discharge port of afterheat steam and be used to control and another distilling kettle between the valve of vapor communication.
According to the embodiment of the present invention; Said device comprise at least the first hydro-thermal distilling kettle and with the second hydro-thermal distilling kettle of the said first hydro-thermal distilling kettle attended operation; The wherein said first hydro-thermal distilling kettle is provided with first opening for feed, first destroyer, first steam inlet, first vapor-nozzle, first discharge port and first vapor interface, and the said second hydro-thermal distilling kettle is provided with second opening for feed, second destroyer, second steam inlet, second vapor-nozzle, second discharge port and second vapor interface; Wherein said first destroyer and said second destroyer are equipped with the material that is used for to sending into said first opening for feed and said first opening for feed respectively and pulverize.At this, " first " and " second " is the statement of relativity.
Said first hydro-thermal distilling kettle and the said second hydro-thermal distilling kettle adopt parallelly connected over-over mode operation; To the said first hydro-thermal distilling kettle and the said second hydro-thermal distilling kettle comparatively speaking, to the hydro-thermal distilling kettle that wherein is in step of reaction introduce from the pressure release steam of the hydro-thermal distilling kettle that is in the pressure release stage in order to dilution water or/and material carries out preheating.
Utilize device of the present invention, carry out the related main technique operation of method of dewatered sludge hydrothermal pretreatment, in an entire run cycle to each hydro-thermal distilling kettle, comprising:
1) in the first hydro-thermal distilling kettle, adds dilution water, wherein preferably in dilution water, add an amount of alkali, be beneficial to promote the hydrolysis reaction of mud;
2) import pressure release steam to the said first hydro-thermal distilling kettle, in order to the dilution water in the said first hydro-thermal distilling kettle of preheating from the said second hydro-thermal distilling kettle;
3) material of dewatered sludge is sent into the first hydro-thermal distilling kettle through pump from the top, make material be broken into fritter through the shredder assembly that is provided with at kettle material inlet place and get in the dilution water that passes through preheating, and be uniformly dispersed;
4) import Boiler Steam to the said first hydro-thermal distilling kettle; Realize the stirring of said material and make said material heat temperature raising under the steam stirring action through said first vapor-nozzle, utilize steam to spray into the still internally-powered and realize that material stirs the said material that makes in the still and is in the required temperature and pressure condition of hydro-thermal reaction;
5) make the hold-time that being reflected in said first distilling kettle kept under the said temperature and pressure condition to be needed, so that abundant hydrolysis of said material and pulp fully;
6) the pressure release steam in the said first hydro-thermal distilling kettle is imported the said second hydro-thermal distilling kettle, in order to the dilution water in the said second hydro-thermal distilling kettle is carried out preheating; And
The material (grog) that 7) will pass through hydrothermal pretreatment is discharged from the said first hydro-thermal distilling kettle.
The invention provides the apparatus and method that can realize the hydrothermal pretreatment of dewatered sludge effectively, the relevant device operational reliability is high, and efficiency of utilization is high, and need not the flash distillation operation.Apparatus and method of the present invention have the following advantages:
1) for other hydrothermal pretreatment equipment and method, has higher energy utilization efficiency, the steam thermal energy that can almost all reclaim pressure leak process and discharged;
2) through adding entry earlier, add the measure of control of mud material again, can guarantee in the still material uniform mixing and have lower viscosity fully, thereby in hydro-thermal reaction, can realize effective heat transfer;
3) need not the flash distillation operation and can realize effective hydrolysis effect, make the device operation more safe and reliable.
Description of drawings
Fig. 1 is according to the dewatered sludge hydrothermal pretreatment device of embodiment of the present invention and operating process synoptic diagram thereof.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is further described.
Illustrate like Fig. 1; The second hydro-thermal distilling kettle 200 that the inventive system comprises the first hydro-thermal distilling kettle 100 and be connected in parallel with it; Wherein, The first hydro-thermal distilling kettle 100 is provided with first opening for feed 110, first destroyer 120, first steam inlet 130, first vapor-nozzle 140, first discharge port 150 and first vapor interface 160, and the second hydro-thermal distilling kettle 200 is provided with second opening for feed 210, second destroyer 220, second steam inlet 230, second vapor-nozzle 240, second discharge port 250 and pressure release vapour outlet 260; Wherein, said first destroyer 120 is equipped with the material that is used for to sending into said first opening for feed 110 with said second opening for feed respectively with said second destroyer 220 and pulverizes.
The said first hydro-thermal distilling kettle 100 and the second hydro-thermal distilling kettle 200 adopt parallelly connected over-over mode operation; To the said first hydro-thermal distilling kettle 100 and the said second hydro-thermal distilling kettle 200 comparatively speaking; Introduce from the pressure release steam of the distilling kettle that is in the pressure release stage, in order to dilution water or material 190 are carried out preheating such as the first hydro-thermal distilling kettle 100 by the distilling kettle that wherein is in step of reaction such as the second hydro-thermal distilling kettle 200.Like this, the first hydro-thermal distilling kettle 100 and the second hydro-thermal distilling kettle 200 of parallel connection through alternate run, just can be effectively used to the hydrothermal pretreatment process of dewatered sludge.
Because the first hydro-thermal distilling kettle 100 in operation and the second hydro-thermal distilling kettle 200 are alternate runs, " first " and " second " is the statement of relativity among this paper, and two distilling kettles are structurally normally identical; In addition; The first hydro-thermal distilling kettle 100 is structurally normally identical as the corresponding component of importing and exporting or be communicated with 200 each self-configuring of the second hydro-thermal distilling kettle; Just its concrete purposes maybe be different in the cycle at specific run; Such as; For certain cycle of operation, the import that first vapor interface 160 of the first hydro-thermal distilling kettle 100 is used as from the afterheat steam of the second hydro-thermal distilling kettle 200, second vapor interface 260 of the second hydro-thermal distilling kettle 200 then is used as the outlet of discharging the pressure release steam to the first hydro-thermal distilling kettle 100 in the same cycle of operation.
Preferably, said destroyer is set to be used with corresponding opening for feed, thereby can mix with water more equably to guarantee that mud is broken effectively.For example, first destroyer 120 is set at the inside of first opening for feed 110, and second destroyer 220 is arranged on the inside of second opening for feed 210.In addition, preferably, first destroyer 120 and second destroyer 220 are the stir-type destroyer.
Preferably, said first vapor-nozzle 104 and second vapor-nozzle 204 are set to have a plurality of nozzles separately.In an embodiment, is furnished with the conduit that is communicated with each nozzle.
Below, carry out exemplary description to the concrete process method that adopts said device to carry out the hydrothermal pretreatment of dewatered sludge.As stated, in general operation, two distilling kettles are alternate runs.For convenience, the first hydro-thermal distilling kettle 100 and the second hydro-thermal distilling kettle 200 are in step of reaction and pressure release stage respectively in the said cycle of operation.
At first add entry to the first hydro-thermal distilling kettle 100 from first opening for feed 110, wherein, according to the degree that the material hydrolysis is required, can add an amount of alkali for example NaOH to accelerate hydrolysis rate and to improve pretreating effect.After in the first hydro-thermal distilling kettle 100, adding a certain amount of dilution water earlier; Treat that operating second distilling kettle 200 gets into the pressure release stage; Just will import from second vapor interface 260 through valve 270, in order to the dilution water in the first hydro-thermal distilling kettle 100 is carried out preheating from the pressure release steam of the second hydro-thermal distilling kettle 200.
After the preheating of water in the first hydro-thermal distilling kettle 100 is accomplished; The material of dewatered sludge is added from first opening for feed 110 through for example pump; Open first destroyer 120 simultaneously; High speed rotating through for example paddle makes material be divided into fritter, and falls into equably in the said dilution water of preheating.
Charging is closed first opening for feed 110 after accomplishing, and imports the steam that comes from the boiler (not shown) through first steam inlet 130, utilizes steam to spray into stirring and heat transfer that the interior power of still is realized material simultaneously.Preferably the material district in the first hydro-thermal distilling kettle 100 is provided with first vapor-nozzle 140; Make material heat temperature raising under the steam stirring action; When treating that temperature in the kettle and pressure reach about 0.5MPa ~ 1.5MPa and about 130 ° of C ~ 180 ° C respectively; Keep about 15min ~ 45min, so that abundant hydrolysis of material and fully pulp, and then obviously improve the dewatering and the anaerobic digestion performance of material.
In some cases; Steam heat can't be absorbed by material rapidly; The top savings of the first hydro-thermal distilling kettle 100 has steam; Send said vapor-nozzle 140 back to after can adopting the steam pressurized of air compressor machine, fully contact the raising heat transfer efficiency with what promote material and steam with the first hydro-thermal distilling kettle, 100 tops.
After the first hydro-thermal distilling kettle 100 is stated the end of step of reaction treating processes above that, just get into the pressure release stage, and the second hydro-thermal distilling kettle 200 is in step of reaction.At this moment, Open valve 170 makes pressure release steam in the first hydro-thermal distilling kettle 100 get into through first vapor interface 160, valve 170 and second vapor interface 260 and has just added in the second hydro-thermal distilling kettle 200 of dilution water, and dilution water is carried out preheating.
When treating that the first hydro-thermal distilling kettle, 100 internal pressures are recovered normal atmosphere, open first discharge port 150, will pass through the material of hydrothermal pretreatment and discharge, thereby accomplish a cycle of operation from the first hydro-thermal distilling kettle 100.
Preferably, the sludge crushing device through the opening for feed with the hydro-thermal distilling kettle is equipped with carries out effective fragmentation to material when charging, and it can be mixed with water more equably.
As previously mentioned, the first hydro-thermal distilling kettle 100 and the second hydro-thermal distilling kettle 200 can take the mode of alternate run to operate, and " first " and the terms such as " second " that are used to describe hydro-thermal distilling kettle and parts thereof among this paper are the statements of relativity.In addition, operation is disposed according to said hydro-thermal distilling kettle can adopt various structure or form such as operational unit such as destroyer and vapor-nozzle and such as interconnecting pieces such as valves, to reach function or effect required for the present invention.
Above embodiment is to be used for to the further describing and explaining of technical scheme of the present invention, is not to be used for the scope of the invention is limited.Therefore, many various modifications that include but not limited to aspects such as structure, material, function, operating method and purposes or changes to content described herein do not break away from notion of the present invention and principle, and are appreciated that and belong to protection scope of the present invention.
Claims (13)
1. device that is used for the dewatered sludge hydrothermal pretreatment; It is characterized in that; Said device comprises at least the first hydro-thermal distilling kettle and the second hydro-thermal distilling kettle that is connected with the said first hydro-thermal distilling kettle fluid; The wherein said first hydro-thermal distilling kettle is provided with first opening for feed, first destroyer, first steam inlet, first vapor-nozzle, first discharge port and first vapor interface, and the said second hydro-thermal distilling kettle is provided with second opening for feed, second destroyer, second steam inlet, second vapor-nozzle, second discharge port and second vapor interface; Wherein, said first destroyer and said second destroyer are equipped with being used for said first opening for feed and said second opening for feed respectively the material of sending into are pulverized.
2. device according to claim 1; Wherein, Said first vapor interface of the said first hydro-thermal distilling kettle forms fluid with said second vapor interface of the said second hydro-thermal distilling kettle and is communicated with, thereby said first hydro-thermal distilling kettle and the said second hydro-thermal distilling kettle adopt parallelly connected over-over mode operation; To the said first hydro-thermal distilling kettle and the said second hydro-thermal distilling kettle comparatively speaking, by the distilling kettle that wherein is in step of reaction introduce from the pressure release steam of the distilling kettle that is in the pressure release stage in order to dilution water or/and material carries out preheating.
3. device according to claim 1 and 2, wherein said first destroyer and said second destroyer are arranged at the inside of said first opening for feed and said first opening for feed respectively.
4. device according to claim 1 and 2, wherein said first destroyer and said second destroyer are beater.
5. device according to claim 1 and 2, wherein said first vapor-nozzle and said second vapor-nozzle are set to have a plurality of nozzles separately.
6. each said device of a utilization such as above-mentioned claim carries out the method for dewatered sludge hydrothermal pretreatment, it is characterized in that said method comprises:
Add dilution water to the said first hydro-thermal distilling kettle;
Import pressure release steam to the said first hydro-thermal distilling kettle, in order to the said dilution water in the said first hydro-thermal distilling kettle of preheating from the said second hydro-thermal distilling kettle;
Add material to the said first hydro-thermal distilling kettle, said material is got into through in the said dilution water of preheating;
Import Boiler Steam to the said first hydro-thermal distilling kettle, and realize the stirring of said material and make said material heat temperature raising under the steam stirring action through said first vapor-nozzle;
Make the said material in the said first hydro-thermal distilling kettle reach and be in required temperature and pressure condition;
Make the hold-time that being reflected in the said first hydro-thermal distilling kettle kept under the said temperature and pressure condition to be needed, so that abundant hydrolysis of said material and pulp fully;
Pressure release steam in the said first hydro-thermal distilling kettle is imported the said second hydro-thermal distilling kettle, in order to the dilution water in the said second hydro-thermal distilling kettle is carried out preheating; And the material that will pass through hydrothermal pretreatment is discharged from the said first hydro-thermal distilling kettle.
7. method according to claim 6 wherein, is containing an amount of alkali in the said dilution water that adds to the said first hydro-thermal distilling kettle, in order to the hydrolysis rate of accelerating material and improve pretreating effect.
8. method according to claim 7, wherein said alkali are NaOH.
9. method according to claim 6, wherein, the said temperature of the said material in the said first hydro-thermal distilling kettle is about 130 ° of C ~ 180 ° C.
10. method according to claim 6, wherein, the said pressure of the said material in the said first hydro-thermal distilling kettle is about 0.5MPa ~ 1.5MPa.
11. method according to claim 6, wherein, the said hold-time of the said temperature and pressure of the said material in the said first hydro-thermal distilling kettle is about 15min ~ 45min.
12. method according to claim 6; Wherein, After importing said Boiler Steam to the said first hydro-thermal distilling kettle; If steam heat can't be is rapidly absorbed and savings steam is arranged at the top of the said first hydro-thermal distilling kettle by said material, then with sending said vapor-nozzle after the said savings steam pressurized back to, to promote fully contacting and improving heat transfer efficiency of said material and steam.
13. method according to claim 6 wherein when the said first hydro-thermal distilling kettle adds said material, also comprises said material is carried out fragmentation, so that said material can and be realized preparatory pulp with the water uniform mixing that passes through preheating.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108840544A (en) * | 2018-07-27 | 2018-11-20 | 成都源永科技发展有限公司 | A kind of reclaiming industrial sludge processing method |
| CN108911466A (en) * | 2018-07-27 | 2018-11-30 | 成都源永科技发展有限公司 | A kind of the high-efficiency dehydration processing system and method for industrial sludge hydro-thermal reaction |
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| JP3993527B2 (en) * | 2002-12-18 | 2007-10-17 | 大阪熱管理工業株式会社 | Evaporative drying equipment |
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| CN202643516U (en) * | 2012-06-21 | 2013-01-02 | 上海同济普兰德生物质能股份有限公司 | Device for sludge water heat pretreatment |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5827700A (en) * | 1981-08-13 | 1983-02-18 | Ebara Infilco Co Ltd | Treatment of sewage sludge |
| JP3993527B2 (en) * | 2002-12-18 | 2007-10-17 | 大阪熱管理工業株式会社 | Evaporative drying equipment |
| CN201085029Y (en) * | 2007-09-14 | 2008-07-16 | 王春成 | Automatic control continuously boiling slurry tank |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108840544A (en) * | 2018-07-27 | 2018-11-20 | 成都源永科技发展有限公司 | A kind of reclaiming industrial sludge processing method |
| CN108911466A (en) * | 2018-07-27 | 2018-11-30 | 成都源永科技发展有限公司 | A kind of the high-efficiency dehydration processing system and method for industrial sludge hydro-thermal reaction |
| CN108840544B (en) * | 2018-07-27 | 2021-10-15 | 成都源永科技发展有限公司 | Industrial sludge recycling treatment method |
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